Feasibility of biohydrogen production from cheese whey using a UASB reactor: Links between microbial community and reactor performance

BIOHYDROGEN FROM CHEESE WHEY TREATMENT IN AN AnSBBR: ACHIEVING PROCESS STABILITY

“…However, this strategy had no effect and the production of CH 4 occurred even at very low pH values, contradicting findings in the literature (Luo et al, 2011). It should be mentioned that the presence of methane, even at pH below 5.0, has been reported in other studies that used cheese whey in acidogenic reactors (Castelló et al, 2009;Carrillo-Reyes et al, 2012).…”

“…Storage of the feed medium in a refrigerator at 4 °C was the first positive step towards stability of hydrogen production (Condition 6), probably because of contamination of the cheese whey in the storage container, due to its high biodegradability (Castelló et al, 2009;Prazeres et al, 2012;Perna et al, 2013). The AnSBBR was thus fed with significant amounts of volatile acids, turning it into a methanogenic reactor of a combined acidogenic-methanogenic process.…”

“…Hence, the operational strategy of Condition 7 was able to eliminate the action of sulfate-reducing bacteria (SRB), which were probably consuming hydrogen in the presence of sulfate according to the reaction Castelló et al (2009) highlight in their work the importance of specific studies related to nutrient supplementation of cheese whey for biohydrogen production. In the specific case of the AnSBBR, supplementation was inadequate for the process and its removal resulted in a significant increase in hydrogen production.…”

Fermentative Hydrogen Production by Molasses; Effect of Hydraulic Retention Time, Organic Loading Rate and Microbial Dynamics

“…They also used granular sludge. In another work (Castelló et al, 2009), the acquired low hydrogen yield was justified by the presence of Olsenella along with Prevotella, Bulleidia, Mitsoukella and Selonomonas species, which consumed the substrate. In this work, C. tyrobutyricum became visible also through the eubacteria specific primers indicating a general proliferation of Clostridium species for vey short HRT that comes in agreement with the low doubling times of 30 min to 3 h that have been observed for most Clostridium species (Dworkin et al, 2006).…”

Feasibility of Bioenergy Production from Ultrafiltration Whey Permeate Using the UASB Reactors

“…Hydrogen has a high energy yield (122 kJ g -1 ), therefore in recent times a great deal of attention is being paid to the usage of hydrogen as a fuel. However, a major doubt on hydrogen as a clean energy alternative is that most of the hydrogen gas is currently generated from fossil fuels by thermochemical processes, such as hydrocarbon reforming, coal gasification and partial oxidation of heavier hydrocarbons (Castellό et al, 2009;Mohan et al, 2007). These methods are considered to be energy intensive and not environmental friendly.…”